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      1 /*	$NetBSD: rtlock.c,v 1.1.1.1 2014/04/01 16:16:07 jakllsch Exp $	*/
      2 
      3 /*++
      4 
      5 Copyright (c) 1998  Intel Corporation
      6 
      7 Module Name:
      8 
      9     lock.c
     10 
     11 Abstract:
     12 
     13     Implements FLOCK
     14 
     15 
     16 
     17 Revision History
     18 
     19 --*/
     20 
     21 
     22 #include "lib.h"
     23 
     24 
     25 
     26 #ifndef __GNUC__
     27 #pragma RUNTIME_CODE(RtAcquireLock)
     28 #endif
     29 VOID
     30 RtAcquireLock (
     31     IN FLOCK    *Lock
     32     )
     33 /*++
     34 
     35 Routine Description:
     36 
     37     Raising to the task priority level of the mutual exclusion
     38     lock, and then acquires ownership of the lock.
     39 
     40 Arguments:
     41 
     42     Lock        - The lock to acquire
     43 
     44 Returns:
     45 
     46     Lock owned
     47 
     48 --*/
     49 {
     50     if (BS) {
     51         if (BS->RaiseTPL != NULL) {
     52             Lock->OwnerTpl = uefi_call_wrapper(BS->RaiseTPL, 1, Lock->Tpl);
     53         }
     54     }
     55     else {
     56         if (LibRuntimeRaiseTPL != NULL) {
     57             Lock->OwnerTpl = LibRuntimeRaiseTPL(Lock->Tpl);
     58         }
     59     }
     60     Lock->Lock += 1;
     61     ASSERT (Lock->Lock == 1);
     62 }
     63 
     64 
     65 #ifndef __GNUC__
     66 #pragma RUNTIME_CODE(RtAcquireLock)
     67 #endif
     68 VOID
     69 RtReleaseLock (
     70     IN FLOCK    *Lock
     71     )
     72 /*++
     73 
     74 Routine Description:
     75 
     76     Releases ownership of the mutual exclusion lock, and
     77     restores the previous task priority level.
     78 
     79 Arguments:
     80 
     81     Lock        - The lock to release
     82 
     83 Returns:
     84 
     85     Lock unowned
     86 
     87 --*/
     88 {
     89     EFI_TPL     Tpl;
     90 
     91     Tpl = Lock->OwnerTpl;
     92     ASSERT(Lock->Lock == 1);
     93     Lock->Lock -= 1;
     94     if (BS) {
     95         if (BS->RestoreTPL != NULL) {
     96             uefi_call_wrapper(BS->RestoreTPL, 1, Tpl);
     97         }
     98     }
     99     else {
    100         if (LibRuntimeRestoreTPL != NULL) {
    101             LibRuntimeRestoreTPL(Tpl);
    102         }
    103     }
    104 }
    105